Tightened site from optional to required on fuel_logs, timesheet_entries,
delivery_notes and purchase_orders now that every route writes it and
every historical row has been backfilled. plant_hours_log was already
required (matches docs/data-model.md's documented invariant, confirmed
against production). timesheets (the document collection) was already
required from Task 6 -- a no-op here, not a regression.
fuel_sheets.site and plant_hours_sheets.site deliberately stay optional:
those sheets can legitimately span multiple sites.
Verified: creating a fuel_logs row with no site now gets a hard 400
(validation_required) from PocketBase itself.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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